Study on Fatigue Performance of Concrete Highway Bridge Under Corrosive Environment

Abstract

Under different environment, reinforced Concrete (RC) Highway Bridge will have different damages along with time and corrosive damage is one of the most frequent damages. In order to have further understand of the influence of corrosive damage to fatigue performance of RC Highway Bridge, experiment to study fatigue performance of RC Highway Bridge under corrosive environment is designed. In the experiment, RC Highway Bridges in coastal cities are selected as object of study and “electro-osmosis, continuous current and drying and wetting cycle” process was used to accelerate corrosion of RC Highway Bridge. Multifunctional load type lab for climate simulation is used to conduct experiment of fatigue performance of RC Highway Bridge. Experiment results are that if it is corrodes for a short period of time, fatigue life mid-span deflection and strain of concrete pressured region of RC Highway Bridgewill be influenced slightly. If RC Highway Bridge is in corrosive environment for a long time, fatigue life would be shortened, and beam deflection and strain of concrete pressured region would be accelerated. Under corrosive environment, fatigue crack source, crack expansion and crack can be seen at the reinforcement fracture of damaged bridge. According to this study results, lifespan of destroyed bridged under corrosive environment can be tested and bridge maintenance can be provided with reliable basis.